Finding the Fourth Proportional to 16,399.28, 24,555.18 and 8,591.72

Step by Step Solution

1. Step 1: Write the proportion equation
   16,399.28 : 24,555.18 = 8,591.72 : x
2. Step 2: Convert to fraction form
   16,399.28/24,555.18 = 8,591.72/x
3. Step 3: Cross multiply
   16,399.28x = 24,555.18 × 8,591.72
4. Step 4: Simplify right side
   16,399.28x = 210,971,231.11
5. Step 5: Solve for x
   x = 210,971,231.11/16,399.28
6. Step 6: Final answer
   x = 12,864.66